Description
Trifocal lenses are similar to bifocal lenses, except that there are three focal areas instead of two. The top portion of the lens is used for distance viewing, the middle is used for intermediate (commonly referred to as computer distance) and the lower portion is used for near or reading correction.
- Trifocals are available in two common segment widths:
- 7x28mm are the most common with the height of the intermediate portion of the lens at 7mm high and the width of the segment at 28mm.
- 8x38mm are made with a slightly larger segment for deeper intermediate and wider reading segments.
Trifocal Lenses are excellent for patients that are currently wearing this design or are unable to adapt to a progressive lens design.
Price includes a pair of lenses. Valid Prescription and PD Measurement are required.
PD Measurement
-
Pupillary Distance (PD) or interpupillary distance is the distance between the centers of the pupils in each eye.
-
The industry standard is to measure in millimeters.
-
This measurement is used when preparing to make prescription glasses.
How do I measure my Pupillary Distance (PD)?

- Help from a friend:
- Place a millimeter ruler on the bridge of your nose.
- Have a friend face you about arms length away.
- Have your friend measure the distance between the center of your pupils (the black dots in the middle of your eyes).
- Measure Yourself:
- Look in the mirror while wearing glasses.
- Draw dots on the lenses where your pupils are (using a non-permanent magic marker or highlighter)
- Take the glasses off and measure the distance between the dots.
- Optometrist or Optician:
- Most eye doctors and/or opticians will take the measurement for you in exchange for a very small service fee.
- Guideline:
- Most Adults measure between 55mm -65mm.
- Most Children measure between 42mm - 54mm.
Now you know your PD Measurement!
A valid prescription with PD Measurement is required to order your new prescription glasses.